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discord-rpc
Discontinued Java Wrapper of the Discord-RPC Library for Discord Rich Presence. (by Vatuu)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You can pretty much search for any library that you're looking for in the programming language that you're familiar with. I'm very familiar with Java, so through a quick google search, I was able to find a Discord Rich Presence Wrapper for Java!
NOTE:
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Hence, a higher number means a more popular project.